<template>
	<view class="almost-lottery">
		<!-- head -->
		<view class="almost-lottery__head">
			<view :class="['action', isApple && 'action-shadow']">
				<text class="gold"></text>
				<text class="content">金币余额：<text class="num">{{ goldCoin }}</text></text>
			</view>
			<view class="tip"><text class="tip-content">每次抽奖消耗 {{ goldNum }} 金币，不限次数</text></view>
		</view>
		<!-- action -->
		<view class="almost-lottery__action-dev" @tap="handleInitCanvas" v-if="isDev">
			<text class="text">重新生成画板-开发模式使用</text>
		</view>
		<!-- lottery -->
		<view class="almost-lottery__wheel">
			<almost-lottery :lottery-size="lotteryConfig.lotterySize" :action-size="lotteryConfig.actionSize"
				:ring-count="2" :duration="1" :img-circled="true" :canvasCached="true" :prize-list="prizeList"
				:prize-index="prizeIndex" @reset-index="prizeIndex = -1" @draw-start="handleDrawStart"
				@draw-end="handleDrawEnd" @finish="handleDrawFinish" v-if="prizeList.length" />
			<view class="almost-lottery__count">
				<text class="text">剩余免费抽奖 {{ freeNum }} 次</text>
			</view>
		</view>
		<!-- rule -->
		<view class="almost-lottery__rule">
			<view class="rule-head">
				<view class="line"></view>
				<text class="title">活动规则</text>
				<view class="line"></view>
			</view>
			<view class="rule-body">
				<view class="item">
					<view class="number">1</view>
					<view class="text">
						<text>抽奖细则：</text>
						<text>每人每天拥有{{ freeNumDay }}次抽奖机会，每次消耗{{ goldNum }}金币。</text>
					</view>
				</view>
				<view class="item item-rule">
					<view class="number">2</view>
					<view class="text">
						<text>奖励说明：</text>
						<text>a.现金奖：系统会即时转入账户余额，可提现。</text>
						<text>b.金币奖：系统会即时转入金币账户，可在平台内使用。</text>
						<text>c.实物奖：中奖后需联系客服领取。</text>
					</view>
				</view>
				<template v-if="isApple">
					<view class="item">
						<view class="number">3</view>
						<view class="text">本次活动由XXXXXXX发起，与Apple.Inc无关。</view>
					</view>
					<view class="item">
						<view class="number">4</view>
						<view class="text">苹果公司不是本活动的赞助商且没有以任何形式参与活动。</view>
					</view>
					<view class="item">
						<view class="number">5</view>
						<view class="text">本活动仅限17岁以上用户参加。</view>
					</view>
					<view class="item">
						<view class="number">6</view>
						<view class="text">本活动最终解释权归XXXXXXX所有。</view>
					</view>
				</template>
				<template v-else>
					<view class="item">
						<view class="number">3</view>
						<view class="text">本次活动由XXXXXXX发起。</view>
					</view>
					<view class="item">
						<view class="number">4</view>
						<view class="text">本活动仅限17岁以上用户参加。</view>
					</view>
					<view class="item">
						<view class="number">5</view>
						<view class="text">本活动最终解释权归XXXXXXX所有。</view>
					</view>
				</template>
			</view>
		</view>
	</view>
</template>

<script>
	import AlmostLottery from '@/uni_modules/almost-lottery/components/almost-lottery/almost-lottery.vue'
	

	import {
		clearCacheFile,
		clearStore
	} from '@/uni_modules/almost-lottery/utils/almost-utils.js'
	export default {
		name: 'Home',
		components: {
			AlmostLottery
		},
		data() {
			return {
				// 开启调试模式
				isDev: true,

				// 以下是转盘配置相关数据
				lotteryConfig: {
					// 抽奖转盘的整体尺寸，单位rpx
					lotterySize: 600,
					// 抽奖按钮的尺寸，单位rpx
					actionSize: 200
				},

				// 以下是转盘 UI 配置
				// 转盘外环图，如有需要，请参考替换为自己的设计稿
				// lotteryBg: require(''),
				lotteryBg: "",
				
				// 抽奖按钮图
				// actionBg: require('../../static/action-bg.png'),
				actionBg: '',

				// 以下是奖品配置数据
				// 奖品数据
				prizeList: [],
				// 奖品是否设有库存
				onStock: true,
				// 中奖下标
				prizeIndex: -1,

				// 是否正在抽奖中，避免重复触发
				prizeing: false,

				// 以下为中奖概率有关数据
				// 是否由前端控制概率，默认不开启，强烈建议由后端控制
				onFrontend: false,
				// 权重随机数的最大值
				prizeWeightMax: 0,
				// 权重数组
				prizeWeightArr: [],

				// 以下为业务需求有关示例数据
				// 金币余额
				goldCoin: 600,
				// 当日免费抽奖次数余额
				freeNum: 3,
				// 每次消耗的金币数
				goldNum: 100,
				// 每天免费抽奖次数
				freeNumDay: 3
			}
		},
		computed: {
			isApple() {
				return uni.getSystemInfoSync().platform === 'ios'
			}
		},
		methods: {
			// 重新生成
			handleInitCanvas() {
				clearCacheFile()
				clearStore()

				this.prizeList = []
				this.getPrizeList()
			},
			// 获取奖品列表
			async getPrizeList() {
				uni.showLoading({
					title: '奖品准备中...'
				})

				// 等待接口返回的数据进一步处理
				let res = await this.requestApiGetPrizeList()
				console.log('获取奖品列表', res)

				if (res.ok) {
					let data = res.data
					if (data.length) {
						this.prizeList = data
						console.log('已获取到奖品列表数据，开始绘制抽奖转盘')

						// 计算开始绘制的时间
						if (console.time) {
							console.time('绘制转盘用时')
						}

						// 如果开启了前端控制概率
						// 得出权重的最大值并生成权重数组
						if (this.onFrontend) {
							// 生成权重数组并排序取得最大值
							this.prizeWeightArr = this.prizeList.map((item) => item.prizeWeight)
							let prizeWeightArrSort = [...this.prizeWeightArr]
							prizeWeightArrSort.sort((a, b) => b - a)

							// 开放自定义权重最大值，没有自定义则取权重数组中的最大值
							this.prizeWeightMax = this.prizeWeightMax > 0 ? this.prizeWeightMax : prizeWeightArrSort[0]
						}
					}
				} else {
					uni.hideLoading()
					uni.showToast({
						title: '获取奖品失败',
						mask: true,
						icon: 'none'
					})
				}
			},
			// 模拟请求 获取奖品列表 接口，
			// 注意这里返回的是一个 Promise
			// 大哥，这里只是模拟，别告诉我你不会对接自己的接口
			requestApiGetPrizeList() {
				return new Promise((resolve, reject) => {
					let requestTimer = setTimeout(() => {
						clearTimeout(requestTimer)
						requestTimer = null

						// prizeStock 奖品库存
						// prizeWeight 中奖概率，数值越大中奖概率越高，权重一样时随机中奖
						resolve({
							ok: true,
							data: [{
									prizeId: 1,
									prizeName: '1元现金',
									prizeStock: 10,
									prizeWeight: 200,
									// prizeImage: require('../../static/git.png')
									prizeImage: ""
								},
								{
									prizeId: 2,
									prizeName: '10元现金',
									prizeStock: 0,
									prizeWeight: 50,
									// prizeImage: 'https://vkceyugu.cdn.bspapp.com/VKCEYUGU-dc-site/56f085e0-bcfe-11ea-b244-a9f5e5565f30.png'
								},
								{
									prizeId: 3,
									prizeName: '5元现金',
									prizeStock: 0,
									prizeWeight: 80
								},
								{
									prizeId: 4,
									prizeName: '50元现金',
									prizeStock: 0,
									prizeWeight: 10,
									// prizeImage: ''
								},
								{
									prizeId: 5,
									prizeName: '200金币',
									prizeStock: 10,
									prizeWeight: 3000,
									// prizeImage: ''
									// prizeImage: ''
								},
								{
									prizeId: 6,
									prizeName: '2元现金',
									prizeStock: 8,
									prizeWeight: 120
								},
								{
									prizeId: 7,
									prizeName: '谢谢参与',
									prizeStock: 100,
									prizeWeight: 10000
								},
								{
									prizeId: 8,
									prizeName: '100金币',
									prizeStock: 100,
									prizeWeight: 3000
								}
							]
						})
					}, 200)
				})
			},
			// 本次抽奖开始
			handleDrawStart() {
				console.log('触发抽奖按钮')
				if (this.prizeing) return
				this.prizeing = true

				// 还有免费数次或者剩余金币足够抽一次
				if (this.freeNum > 0 || this.goldCoin >= this.goldNum) {

					// 更新免费次数或金币余额
					if (this.freeNum > 0) {
						this.freeNum--
					} else if (this.goldCoin >= this.goldNum) {
						this.goldCoin -= this.goldNum
					}

					this.tryLotteryDraw()
				} else {
					uni.showModal({
						title: '金币不足',
						content: '是否前往赚取金币？',
						success: (res) => {
							// 这里需要根据业务需求处理，一般情况下会引导用户前往赚取金币的页面
							console.log('金币不足', res)
						},
						complete: () => {
							this.prizeing = false
						}
					})
				}
			},
			// 尝试发起抽奖
			tryLotteryDraw() {
				console.log('旋转开始，获取中奖下标......')
				// 判断是否由前端控制概率
				if (this.onFrontend) {
					this.localGetPrizeIndex()
				} else {
					this.remoteGetPrizeIndex()
				}
			},
			// 本地获取中奖下标
			localGetPrizeIndex() {
				console.warn('###当前处于前端控制中奖概率，安全起见，强烈建议由后端控制###')
				// 前端控制概率的情况下，需要拿到最接近随机权重且大于随机权重的值
				// 后端控制概率的情况下，通常会直接返回 prizeId
				if (!this.prizeWeightMax || !this.prizeWeightArr.length) {
					console.warn('###当前已开启前端控制中奖概率，但是奖品数据列表中的 prizeWeight 参数似乎配置不正确###')
					return
				}
				console.log('当前权重最大值为 =>', this.prizeWeightMax)

				// 注意这里使用了 Math.ceil，如果某个权重的值为 0，则始终无法中奖
				let randomWeight = Math.ceil(Math.random() * this.prizeWeightMax)
				console.log('本次权重随机数 =>', randomWeight)

				// 生成大于等于随机权重的数组
				let tempMaxArrs = []
				this.prizeList.forEach((item) => {
					if (item.prizeWeight >= randomWeight) {
						tempMaxArrs.push(item.prizeWeight)
					}
				})
				console.log('tempMaxArrs', tempMaxArrs)

				// 如果大于随机权重的数组有值，先对这个数组排序然后取值
				// 反之新建一个临时的包含所有权重的已排序数组，然后取值
				let tempMaxArrsLen = tempMaxArrs.length
				if (tempMaxArrsLen) {
					tempMaxArrs.sort((a, b) => a - b)
					// 取值时，如果存在多个值，分两种情况
					if (tempMaxArrsLen > 1) {
						// 检查是否存在重复的值
						let sameCount = 0
						for (let i = 0; i < tempMaxArrs.length; i++) {
							if (tempMaxArrs[i] === tempMaxArrs[0]) {
								sameCount++
							}
						}

						// 值不相等的情况下取最接近的值，也就是第1个值
						if (sameCount === 1) {
							this.prizeIndex = this.prizeWeightArr.indexOf(tempMaxArrs[0])
						} else {
							// 存在值相等时，随机取值，当然这里你可以自己决定是否随机取值
							let sameWeight = tempMaxArrs[0]
							let sameWeightArr = []
							let sameWeightItem = {}
							this.prizeWeightArr.forEach((item, index) => {
								if (item === sameWeight) {
									sameWeightArr.push({
										prizeWeight: item,
										index
									})
								}
							})
							console.log('sameWeightArr', sameWeightArr)
							sameWeightItem = sameWeightArr[Math.floor(Math.random() * sameWeightArr.length)]
							console.log('sameWeightItem', sameWeightItem)
							this.prizeIndex = sameWeightItem.index
						}
					} else {
						this.prizeIndex = this.prizeWeightArr.indexOf(tempMaxArrs[0])
					}
				}

				console.log('本次抽中奖品 =>', this.prizeList[this.prizeIndex].prizeName)

				// 如果奖品设有库存
				if (this.onStock) {
					console.log('本次奖品库存 =>', this.prizeList[this.prizeIndex].prizeStock)
				}
			},
			// 远程请求接口获取中奖下标
			// 大哥，这里只是模拟，别告诉我你不会对接自己的接口
			remoteGetPrizeIndex() {
				console.warn('###当前处于模拟的请求接口，并返回了中奖信息###')
				// 模拟请求接口获取中奖信息
				let stoTimer = setTimeout(() => {
					stoTimer = null

					let list = [...this.prizeList]

					// 这里随机产生的 prizeId 是模拟后端返回的 prizeId
					let prizeId = Math.floor(Math.random() * list.length + 1)

					// 拿到后端返回的 prizeId 后，开始循环比对得出那个中奖的数据
					for (let i = 0; i < list.length; i++) {
						let item = list[i]
						if (item.prizeId === prizeId) {
							// 中奖下标
							this.prizeIndex = i
							break
						}
					}

					console.log('本次抽中奖品 =>', this.prizeList[this.prizeIndex].prizeName)

					// 如果奖品设有库存
					if (this.onStock) {
						console.log('本次奖品库存 =>', this.prizeList[this.prizeIndex].prizeStock)
					}
				}, 200)
			},
			// 本次抽奖结束
			handleDrawEnd() {
				console.log('旋转结束，执行拿到结果后到逻辑')

				// 旋转结束后，开始处理拿到结果后的逻辑
				let prizeName = this.prizeList[this.prizeIndex].prizeName
				let tipContent = ''

				if (prizeName === '谢谢参与') {
					tipContent = '很遗憾，没有中奖，请再接再厉！'
				} else {
					// 如果奖品设有库存
					if (this.onStock) {
						let prizeStock = this.prizeList[this.prizeIndex].prizeStock
						tipContent = prizeStock ? `恭喜您，获得 ${prizeName}` : `很抱歉，您来晚了，当前奖品 ${prizeName} 已无库存`
					} else {
						tipContent = `恭喜您，获得 ${prizeName} ！`
					}
				}

				uni.showModal({
					content: tipContent,
					showCancel: false,
					complete: () => {
						this.prizeing = false
					}
				})
			},
			// 抽奖转盘绘制完成
			handleDrawFinish(res) {
				console.log('抽奖转盘绘制完成', res)

				if (res.ok) {
					// 计算结束绘制的时间
					if (console.timeEnd) {
						console.timeEnd('绘制转盘用时')
					}
				}

				let stoTimer = setTimeout(() => {
					stoTimer = null

					uni.hideLoading()
					uni.showToast({
						title: res.msg,
						mask: true,
						icon: 'none'
					})
				}, 50)
			}
		},
		onLoad() {
			this.prizeList = []
			this.getPrizeList()
		},
		onUnload() {
			uni.hideLoading()
		}
	}
</script>

<style lang="scss" scoped>
	.almost-lottery {
		flex: 1;
		background-color: #FF893F;
	}

	.almost-lottery__head {
		position: relative;
		width: 100%;
		height: 640rpx;
		// background: url('~static/images/lottery/top-bg.png') no-repeat center center/cover;
		background: url('https://s1.ax1x.com/2023/03/15/pp38Gdg.png') no-repeat center center/cover;

		.action {
			position: relative;
			top: 400rpx;
			display: flex;
			justify-content: center;
			align-items: center;
			width: 480rpx;
			height: 88rpx;
			line-height: 88rpx;
			margin: 0 auto;
			color: #FFFFFF;
			font-size: 32rpx;
			background-color: rgba(255, 136, 61, 1);
			border-radius: 44rpx;
		}

		.action-shadow {
			box-shadow: 0px 14rpx 0px 0px rgba(235, 112, 36, 1);
		}

		.gold {
			width: 44rpx;
			height: 44rpx;
			margin-right: 10rpx;
			background-repeat: no-repeat;
			background-position: center center;
			background-size: contain;
			// background-image: url("~static/images/lottery/gold.png");
			background-image: url("https://s1.ax1x.com/2023/03/15/pp3GemT.png");

			@media (-webkit-min-device-pixel-ratio: 2),
			(min-device-pixel-ratio: 2) {
				// background-image: url("~static/images/lottery/gold@2x.png");
				background-image: url("https://s1.ax1x.com/2023/03/15/pp3Gn7F.png");
			}

			@media (-webkit-min-device-pixel-ratio: 3),
			(min-device-pixel-ratio: 3) {
				// background-image: url("~static/images/lottery/gold@3x.png");
				background-image: url("https://s1.ax1x.com/2023/03/15/pp3GMtJ.png");
			}
		}

		.num {
			color: #F9FC31;
		}

		.tip {
			position: relative;
			top: 428rpx;
			color: #FFFFFF;
			font-size: 24rpx;
			text-align: center;
		}
	}

	.almost-lottery__wheel {
		text-align: center;

		.almost-lottery__count {
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			text-align: center;
			padding: 40rpx 0;
		}

		.text {
			color: #FFFFFF;
			font-size: 24rpx;
		}
	}

	.almost-lottery__rule {
		padding: 0 28rpx;
		color: #FFF8CB;

		.rule-head {
			display: flex;
			justify-content: space-around;
			align-items: center;
			margin: 40rpx 0;

			.line {
				flex: 1;
				height: 1px;
				background-color: #FFF3A5;
			}

			.title {
				width: 280rpx;
				color: #F63857;
				line-height: 70rpx;
				text-align: center;
				margin: 0 20rpx;
				border-radius: 8rpx;
				background-image: linear-gradient(0deg, rgba(255, 242, 158, 1), rgba(255, 244, 168, 1));
			}
		}

		.rule-body {
			color: #FFF8CB;
			font-size: 24rpx;
			padding: 10rpx 0 40rpx;

			.item {
				display: flex;
				margin-bottom: 10rpx;
			}

			.number {
				position: relative;
				top: 4rpx;
				width: 28rpx;
				height: 28rpx;
				line-height: 28rpx;
				text-align: center;
				color: #F63857;
				background: #FFF8CB;
				border-radius: 50%;
				margin-right: 10rpx;
			}

			.text {
				flex: 1;
			}

			.item-rule .text {
				display: flex;
				flex-direction: column;
			}
		}
	}

	.almost-lottery__action-dev {
		display: flex;
		flex-direction: row;
		justify-content: center;
		align-items: center;
		width: 400rpx;
		height: 80rpx;
		border-radius: 10rpx;
		text-align: center;
		background-color: red;
		margin: 0 auto 40rpx;

		.text {
			color: #FFFFFF;
			font-size: 28rpx;
		}
	}
</style>
